Piston



Aiig. 6, 9, F. J. LEMIEQX 1,123,187

' PISTON I Filed Jan. 4, 1927 2 Sheets-Sheet 1 gwomtm Aug. 6, 1929. F. J. LEMIEUX 1,723,187

PISTON Filed Jan. 1927 2 Sheets-Sheet 2 feffiembauao.

Patented Aug. 6, 12329.

PATENT OFFICE.

FRANK J. LEMIEUX, OF CENTRAL FALLS, RHODE ISLAND.

PISTON.

Application filed January 4, 1927.

This invention rcin'i useful improxciiieniis i i .horviccnblo iii oozmemiczi with intc bust-ion engines, buivcupsble of for other :inds of engines, pijiii'ips like,

es to certain new and ii pis'hms pertic uuirly o riizii coiniieriil use and the lilore particular" the iuvcuuou embodies an improred L comprising; :i liollmv cylindrical body poi adopted {to he carried by :1 pishm rodor c: 111C fiii1 rod, and w heed dehiclmhly secured .13 body po t on to pcririil ready removal or placement ol 1 coking ring or iihi owing un uc explii'isiio' if (he 1211 501 or removal oi i body portion :lronr'lthe rod or Work. cyliiid A further object is to piston capable of beiii coz'iveiii is Well eiimieiro iii opera/o1 'Anoiher obj ecl' is to provide simple effective iiieeiis d hichabiy connecting ports of the pision for illillfli'ilililllg 'ie is;- i-er in operative concitioii. Still um U101 object is to p11 and cilectivc means "for locking assembled relation some will nectod on though living" capah z disconnection.

Other objwill bccoii'ie parent nature of the hive -.r unde sod, and the some co sits in the novel form, *oii'ibiiizitioh and. zirr eiiien' of pa, ere- .iiiat'i'ter mo e fully described, shown in the accompanying drm and c aimed.

in the drawings, wherein hie reference chsracl'ers indicate eorrespording parts throughout the se Figure 1 o developed 7 showing all of the pm i of relation in which they are Figure 2 is 2 side elevzi piston iii esseiiibled coirlitiou; iii

Figure 3 is eccnl'rzil longitiidinal section taken substantially upon line 33 of Figure 2.

Referring more in detail to the drawings,

the )rcsent sisoon embodies whet me be generally termed as a hollow cylini'lrical body portion composed of an inner section .the bearings ll Serial No. 158,887.

5 and preferably two ring-like packing rings a head. or cop plate 8 detuchebly connected to the section 5 one retoiningtlie sections (3 and 7 in place.

As shown clearly in Figures 1 and 3, the inner section 5 forn'ied with an outer end Wall 9, and 1 skirt here shown as embodying a. pair of opposed segmental sections having opposi ely disposed inwardly projecting besrngs ll adapted to carry a WllSl) pin fo the connectiiw' ro h the pin and rod not being; shown as ill ey operate in he usual Well known iiizmner. It will be seen that integrally join with the undersijle .i the Well 9 so as to present a srongr, durahie construction. While it is desirable to cut umiyihe Sklrb 21s shi wn so it COIi'lPOSQCl of similar opposed seg- :ticus 10 it nevertheless to be i b may he of con- 1 unlersiwod that the ski ilillllfil'lfi form as r SUZLl, such cutting away of the skirt being merely p i1c;1sed to some- Whot reduce the Weight oi? the piston when 'ed. In a like manner, the section with ii outer on d to prondricol extension 13 on which the of section 7 is removzibiy fiated, 7 formed 'o'ii'h o l'urlther reducec While the ,"eclio:

siini or cylindrical eiileiisioi l l onto which is removahly fitted tlc' inw; rdly projecting *yliiidrical packing receiving portion 15 of the head or cap plate 8.

The sections 6 and 7 are provided with peripheral pecki i; spacing flanges or ribs 16 and 17 or min 11:11 form, the flange 16 coope liig With the wall 9 to form inner pecking 1g receiving grooves, the flange l7 cooperating with the flange 16 to form an intermediate packing ringr receiving groove, and the head or carp plate 8 being provided with a peripheral annular flange l8 outwardly of the packing ring receiving portion 15 thereof. cooperating with the flange 17 to form an outer packing ring receiving groove.

The outer end Wall 9 of the inner section 5 is formed with an axial outwardly project- :ihly engaged ing inte nally threaded hollow boss 19 adapted for threaded reception of an externally threaded axial stem or stud 20 termed integral with and projecting inwardly from the head or cap plate 8. Thus, when the several parts are assembled in the relation shown and described above and the head 8 is rotated relative to the section 5 so as to thread the stem 20 into the boss 19, the head will be detachably connected to the inner section 5, and the several parts will be drawn into tight contiguous relation with the sections 6 and '7 and the packing ring etlectively retained in place. it will be apparent that by reason of the interfitting engagement ol the sections, they will all be properly entered and retained in this proper relation when assembled.

In order to effectively guard a 'ainst accidental turning of the head and threading ol" the stem 20 out of the boss 19 such as would result in separation of the piston sections, releasable means is provided for locking the stem 20 to the boss 19. This locking means neterably consists in the provision of a longitudinal threaded internal groove 21 in the boss 19 and a complemental groove exteriorly 0t and longitudinally ithe stem 20, said groove 21 being adapted for registry with the groove 22 when the piston parts are assembled for reception ot' a locking screw 23. ln order to permit ready insertion of and access to the locking crew 23, the head 8 is provided with an opening 2% therethrough communicating with the groove 22 and adapted to communicate with the groove 21 when the latter is registered with groove 22 as noted above. It is thus ap parent that the grooves 21 and 22 cooperate to form a threaded socket into which the screw 23 is threa led upon insertion through the opening 24 in the piston head section 8, and as the socket is partially formed in the integral parts of the head and section 5, relative turning oi these parts will be effectively prevented. This locking is made additionally secure by adapting the opening 24 to receive the head oii screw 23, and pee the material of the head 8 over the head of screw 23 as 25 so that the screw 23 may not accidentally back out of the grooves 21 and 22 when the piston is in use. However, this peened over material may be readily displaced when the screw 23 is toroiblv turned by the use of a screwdriver, and

it will not, accordingly, interfere with the intentional separation or" the piston sections or parts. In order to better guard against loss of compression, the grooves 21 and 22 preferably terminate outwardly of the inner end of stem 20 as shown in Figure 3.

From the above, it will be seen that when the head of the cylinder in which the pistons operate, is removed, the screw 23 is readily accessible for removal, and in order to permit subsequent turning of the head 8 for its removal without disconnecting the body 5 from the connecting rod or removing it from the cylinder, said head 8 is equipped with sockets 26 in its outer surface for reception of the driving contacts of a spanner wrench or the like. It will be noted that the boss 19 is considerably spaced from the sections 6 and 7 so that an annular closed air space is formed in the outer end of the piston that will tend to avoid overheating ot the piston wl en in use.

Upon removal of the head 8 as outlined above, it will be seen that the outer packing ring may be readily removed from the portion 15 of the head and a new ring placed thereon, while similar tree removal or the sections 6 and '7 and their resgective acking rings is also permitted. A reversal or" this operation will etl'ect convenient and expeditious re-assembling oi the parts.

it is apparent that the construction is of most simple and durable character and involves amininium number ot' parts, none oi whien are trail or likely to readily become dan'iaged or broken.

As shown in Figures 1 and 3, the wall 9 is provided with a circular series of obliquely extending openings or passages 2? which extend from the inner side or the innermost packing ring receiving groove to the interior of the inner section or bot y section 5. These passages or openings 27 provide efficientmeans for conducting lubricant or oil to and from the faces of the cylinder and piston when in use, and one passage 27 communicates with the interior of each bearing 11 so as to insure a proper supply of lubricant to the latter. The passages leading to tl e bean ings 11 are clearly shown in Figure 3.

From the foregoing description it is believed that the construction and operation as well as the advantages of the present in vention will be readily understood and ap preciatel by those skilled in the art.

Minor changes may be made without de parting from the spirit and scope of the in vention as claimed.

What I claim as new is A piston comprising a body part having an outwardly extending, central, internally threaded boss, and a cap having an esternally threaded stem fitted to said boss, said cap being spaced from said body part for the reception of superposed annular ring holding members and said members being spaced trom said boss, a substantial distance and providing a closed air space to prevent undue heatiin of the piston.

In testimony whereof I aflix my signature.

FRANK J. LEMIEUX. 

